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7.B. - Page 60 Redwood City Chapter 4.Environmental Impact Analysis City and C/CAG LOS standards. Furthermore,the construction would only last for a period of seven weeks and would not result in any lane or road closures.Therefore,new traffic impacts caused by the construction of the proposed modifications would be less than significant. Operation Project Trip Estimates New vehicle trips associated with the proposed modifications were developed based on trip end counts and trip type surveys collected at the existing fueling center and the trip data from other Costco wholesale centers in the United States that have similar characteristics as the project with the proposed modifications. Trip end counts and trip type surveys were collected at the existing facility during the weekday PM and weekend midday peak hours.The results of the trip end counts and site-specific trip types,as described below,are used to determine the project's net trip contribution to the roadway system. Table 4.3-3 summarizes the existing trip types and resulting net trip contribution based on the survey data.Detailed discussions of trip survey and supporting site activities data are included in Appendix B (Preliminary Transportation Assessment prepared by Kittelson&Associates,Inc.). • Internal Trips—A key finding from the data collection is that approximately 22 percent of the weekday PM and 47 percent of the Saturday midday peak hour trips (shown in Table 4.3-3) to and from the existing fueling center are internal capture trips.Internal capture trips are trips by members who patronize both the warehouse and the fueling center during a single visit to the Costco site.As such,although they account for a trip to both the warehouse and the fueling center,they only account for one overall vehicle trip to the site and on the surrounding transportation system. • Pass-by Trips—Another key trip characteristic that must be considered is pass-by trip capture. Pass-by trips represent members (and trips)that are currently traveling on the street adjacent to the site (Middlefield Road) for some other primary purpose (such as a trip from work to home) and stop at the fueling center en route during their normal travel.As such,pass-by trips do not result in a net increase in traffic on the surrounding transportation system and,typically, their only effect occurs at the site access driveways where they become turning movements. Table 4.3-3 shows that,based on the surveys collected at the existing fueling center,on average 22 percent of the trips during the weekday PM peak hour and 29 percent of the trips during the weekend midday peak hour can be classified as pass-by trip capture from the surrounding street system.This is lower than the average capture rate quoted in the Trip Generation Manual (Institute of Transportation Engineers 2008) for typical service stations (58 percent in the AM and 42 percent in the PM) and,again,is attributable to the unique travel characteristics that result from Costco's membership requirements. • Diverted Trips—The final type of trip to consider is diverted trips. Diverted trips represent members (and trips)that are currently traveling on the surrounding street system in the project area again for some other primary purpose (such as a trip from work to home) and divert from their normal route to travel to the fueling center.An example would be someone who normally travels on Woodside Road on their trip home from work who diverts off of Woodside Road to travel on Middlefield Road to the Costco site.As such,diverted trips do not result in a net increase to those intersections further from the site that they normally travel through,but they do become additional trips on the roadways along their diverted route and at the site driveways. Addendum No.2 to the Environmental Impact Report for 4-15 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12